Resolve #1731

Plumb through directory
Needs updated Extensions nuget

Author: MikeStall

src/WebJobs.Script/Binding/CoreExtensionsScriptBindingProvider.cs

@@ -20,11 +20,13 @@ public CoreExtensionsScriptBindingProvider(JobHostConfiguration config, JObject
         {
         }
 
+        public string AppDirectory { get; set; }
+
         /// <inheritdoc/>
         public override void Initialize()
         {
             Config.UseTimers();
-            Config.UseCore();
+            Config.UseCore(AppDirectory);
         }
 
         /// <inheritdoc/>

src/WebJobs.Script/Host/ScriptHost.cs

@@ -471,6 +471,9 @@ protected virtual void Initialize()
                 var bindingProviders = LoadBindingProviders(ScriptConfig, hostConfigObject, TraceWriter, _startupLogger, usedBindingTypes);
                 ScriptConfig.BindingProviders = bindingProviders;
 
+                var coreBinder = bindingProviders.OfType<CoreExtensionsScriptBindingProvider>().First();
+                coreBinder.AppDirectory = ScriptConfig.RootScriptPath;
+
                 // Allow BindingProviders to initialize
                 foreach (var bindingProvider in ScriptConfig.BindingProviders)
                 {